package com.ls.fw.web.core.servlet.utils;

import java.util.StringTokenizer;

import javax.servlet.http.Cookie;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * RequestUtil.java
 * 
 * @author Defender 2013-8-3 下午08:00:21
 */
public class RequestUtil {

	private static final Log log = LogFactory.getLog(RequestUtil.class);

	/**
	 * Checkstyle rule: utility classes should not have public constructor
	 */
	private RequestUtil() {
	}

	/**
	 * Convenience method to set a cookie
	 * 
	 * @param response
	 *            the current response
	 * @param name
	 *            the name of the cookie
	 * @param value
	 *            the value of the cookie
	 * @param path
	 *            the path to set it on
	 */
	public static void setCookie(HttpServletResponse response, String name,
			String value, String path) {
		if (log.isDebugEnabled()) {
			log.debug("Setting cookie '" + name + "' on path '" + path + "'");
		}

		Cookie cookie = new Cookie(name, value);
		cookie.setSecure(false);
		cookie.setPath(path);
		cookie.setMaxAge(3600 * 24 * 30); // 30 days

		response.addCookie(cookie);
	}

	/**
	 * Convenience method to get a cookie by name
	 * 
	 * @param request
	 *            the current request
	 * @param name
	 *            the name of the cookie to find
	 * 
	 * @return the cookie (if found), null if not found
	 */
	public static Cookie getCookie(HttpServletRequest request, String name) {
		Cookie[] cookies = request.getCookies();
		Cookie returnCookie = null;

		if (cookies == null) {
			return returnCookie;
		}

		for (final Cookie thisCookie : cookies) {
			if (thisCookie.getName().equals(name)
					&& !"".equals(thisCookie.getValue())) {
				returnCookie = thisCookie;
				break;
			}
		}

		return returnCookie;
	}

	/**
	 * Convenience method for deleting a cookie by name
	 * 
	 * @param response
	 *            the current web response
	 * @param cookie
	 *            the cookie to delete
	 * @param path
	 *            the path on which the cookie was set (i.e. /appfuse)
	 */
	public static void deleteCookie(HttpServletResponse response,
			Cookie cookie, String path) {
		if (cookie != null) {
			// Delete the cookie by setting its maximum age to zero
			cookie.setMaxAge(0);
			cookie.setPath(path);
			response.addCookie(cookie);
		}
	}

	public static void test(HttpServletRequest request) {
		String Agent = request.getHeader("User-Agent");
		StringTokenizer st = new StringTokenizer(Agent, ";");
		while (st.hasMoreTokens()) {
			System.out.println("carry:" + st.nextToken());
			// System.out.println("  " + test.nextToken("*"));
		}
	}
}
